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C Programming Questions and Answers – Register Variables

C Programming Questions and Answers – Register Variables

1.What is the output of this C code?

#include <stdio.h>

int main()

{

register int i = 10;

int *p = &i;

*p = 11;

printf(“%d %d\n”, i, *p);

}

a) Depends on whether i is actually stored in machine register

b) 10 10

c) 11 11

d) Compile time error

View Answer

Answer:d

 

2.register keyword mandates compiler to place it in machine register.

a) true

b) false

c) Depends on the standard

d) None of the mentioned

View Answer

Answer:b

 

3.What is the output of this C code?

 

#include <stdio.h>

int main()

{

register static int i = 10;

i = 11;

printf(“%d\n”, i);

}

a) 10

b) Compile time error

c) Undefined behaviour

d) 11

View Answer

Answer:b

 

4.What is the output of this C code?

 

#include <stdio.h>

int main()

{

register auto int i = 10;

i = 11;

printf(“%d\n”, i);

}

a) 10

b) Compile time error

c) Undefined behaviour

d) 11

View Answer

Answer:b

 

5.What is the output of this C code?

 

#include <stdio.h>

int main()

{

register const int i = 10;

i = 11;

printf(“%d\n”, i);

}

a) 10

b) Compile time error

c) Undefined behaviour

d) 11

View Answer

Answer:b

 

6.Register storage class can be specified to global variables

a) true

b) false

c) Depends on the compiler

d) Depends on the standard

View Answer

Answer:b

 

7.Which among the following is wrong for “register int a;” ?

a) Compiler generally ignores the request.

b) You cannot take the address of this variable

c) Access time to a is critical

d) None of the mentioned

View Answer

Answer:d

 

8.What is the output of this C code?

 

#include <stdio.h>

void main()

{

register int x = 5;

m();

printf(“x is %d”, x);

}

void m()

{

x++;

}

a) 6

b) 5

c) Junk value

d) Compile time error

View Answer

Answer:d

 

9.When compiler accepts the request to use the variable as a register?

a) It is stored in CPU

b) It is stored in cache memory

c) It is stored in main memory

d) It is stored in secondary memory

View Answer

Answer:a

 

10.Which data type can be stored in register?

a) int

b) long

c) float

d) All of the mentioned

View Answer

Answer:d

 

11.Which of the following operation is not possible in a register variable?

a) Reading the value into a register variable

b) Copy the value from a memory variable

c) Global declaration of register variable

d) All of the mentioned

View Answer

Answer:d

 

12.Which among the following is the correct syntax to declare a static variable register?

a) static register a;

b) register static a;

c) Both (a) and (b)

d) We cannot use static and register together.

View Answer

Answer:d

 

13.Register variables reside in

a) stack

b) registers

c) heap

d) main memory

View Answer

Answer:b

 

14.What is the output of this C code?

 

#include <stdio.h>

void main()

{

register int x = 0;

if (x < 2)

{

x++;

main();

}

}

a) Segmentation fault

b) main is called twice

c) main is called once

d) main is called thrice

View Answer

Answer:a

 

15.What is the output of this C code?

 

#include <stdio.h>

void main()

{

register int x;

printf(“%d”, x);

}

a) 0

b) Junk value

c) Compile time error

d) Noting

View Answer

Answer:b

 

 

16.What is the output of this C code?

 

#include <stdio.h>

register int x;

void main()

{

printf(“%d”, x);

}

a) varies

b) 0

c) Junk value

d) Compile time error

View Answer

Answer:d

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